Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Effect of chemical doping on heterostructured Fe-based superconductor Sr2VO3FeAs

  • Ok, Jong Mok (Department of Physics, Pohang University of Science and Technology) ;
  • Na, Se Woong (Department of Physics, Pohang University of Science and Technology) ;
  • Kim, Jun Sung (Department of Physics, Pohang University of Science and Technology)
  • Received : 2018.02.23
  • Accepted : 2018.03.24
  • Published : 2018.03.31
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Abstract

Phase diagrams of electron- and hole-doped $Sr_2VO_3FeAs$ are investigated using Co and Mn substitution at Fe site. Metallic nature survives only for Co (electron) doping, not for Mn (hole) doping. The conductivity of $Sr_2VO_3(Fe,M)As$ (M=Mn,Co) is sensitive to the structural modification of FeAs microstructure rather than carrier doping. This finding implies that the FeAs layer plays a dominant role on the charge conduction, thus the $SrVO_3$ layers should be considered as an insulating block. Also, we found that the superconductivity is rapidly suppressed by both dopants. This result is different from the conventional behavior that superconductivity is induced by doping in the most of Fe pnictides. Our finding strongly supports the uniqueness of $Sr_2VO_3FeAs$ among the Fe pnictide superconductors.

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References

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